ME. Gr. J. EOMANES ON THE LOCOMOTOE SYSTEM OE MEDUSiE. 
313 
for any constant relationship. Dr. Eimer, indeed, is careful to state that the relation- 
ship he points out is one that is liable to very frequent exceptions ; but even if it were 
found only to apply to a tolerably large percentage of cases, it would be relationship 
full of interest to the physiologist. 
It is needless to say that there is a complete agreement between Dr. Eimer and 
myself as regards the results of section. 
Concerning Dr. Eimer’s histological observations, it is, of course, impossible for 
me to say any thing; for he neither figures nor describes the elements which he 
regards as nervous. They may therefore or may not correspond with appearances 
which I have myself observed. 
It only remains to notice Dr. Eimer’s statement with reference to Cyancea capillata. 
He says that the effects of the fundamental operation upon this species were precisely 
similar to the effects of it upon Aurelia aurita , whereas in my experience it was not so. 
As already stated, I found these effects to be analogous , but not identical — Cyancea 
capillata , as a rule , being less frequently or less completely paralyzed by excision of its 
lithocysts alone than was Aurelia aurita. I can only explain this discrepancy between 
Dr. Eimer and myself by the fact which he states, viz. that he performed but few 
experiments on Cyancea capillata. 
In now concluding this somewhat elaborate postscript, I wish it to be understood 
that I have mentioned the various points in which Dr. Eimer and myself do not quite 
agree, only because I think it is for the benefit of the subject on which we are both 
engaged that such differences should be noted before the work of another year begins 
In this way, when opportunity again affords, we may both be able to repeat such of our 
observations as are now rendered doubtful by want of complete accordance. 
G. J. E. 
Explanation of the Plates. 
PLATE 32. 
Aurelia aurita, nat. size. The animal is represented in full diastole, witli its polypite 
removed. In some details the drawing is not quite accurate. 
PLATE 33. 
Aurelia aurita , with polypite and seven lithocysts removed, submitted to spiral section. 
